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WorksheetsElectro-Magnetism Quiz
Total questions: 35
Worksheet time: 18mins
What does Oersted's experiment suggest about a current-carrying wire?
It emits light.
It produces a sound wave.
It produces a magnetic field around it.
It generates heat.
What shape do the magnetic field lines form around a straight conductor?
Ellipses
Concentric circles
Straight lines
Spirals
What happens to the compass needle when the direction of current is reversed?
It stops moving.
It moves faster.
The direction of deflection gets reversed.
It changes color.
What rule is used to find the direction of the magnetic field?
Fleming's rule
Right-hand thumb rule
Ampere's rule
Left-hand rule
What happens to the magnetic field lines when the current in the wire is increased?
They become less dense.
They disappear.
They change direction.
They become denser.
What is the effect of increasing the number of turns in a loop on the magnetic field?
It increases the magnetic field strength.
It reverses the magnetic field.
It has no effect.
It decreases the magnetic field strength.
What does one face of a current-carrying loop act as?
An insulator
A neutral point
A north pole
A south pole
What is a solenoid?
A coil of wire
A type of magnet
A type of battery
A type of transformer
What happens to the magnetic field lines inside a solenoid?
They form loops.
They are circular.
They are nearly straight and parallel.
They are chaotic.
What is the main difference between a current-carrying solenoid and a bar magnet?
A solenoid cannot attract iron.
A solenoid is always stronger.
A solenoid has a fixed magnetic field.
A solenoid can be turned off.
What is an electromagnet?
A type of transformer
A permanent magnet
A type of battery
A temporary magnet made of soft iron
What happens to an electromagnet when the current is switched off?
It becomes permanent.
It attracts more iron.
It becomes stronger.
It loses its magnetic properties.
What is the purpose of increasing the number of turns in an electromagnet?
To increase the magnetic field strength.
To decrease the magnetic field strength.
To change the polarity.
To make it permanent.
What is the main use of electromagnets?
To create permanent magnets.
To store energy.
To lift and transport large masses.
To generate electricity.
What is the main difference between an electromagnet and a permanent magnet?
Electromagnets are made of steel.
Permanent magnets are temporary.
Permanent magnets can be turned off.
Electromagnets can change polarity.
What is the principle behind the working of an electric bell?
Thermal expansion
Electromagnetic induction
Magnetic attraction
Static electricity
What happens to a current-carrying conductor in a magnetic field?
It heats up.
It does not move.
It moves in the direction of the current.
It experiences a force.
What does Fleming's left-hand rule help determine?
Direction of current
Direction of magnetic field
Direction of force
Direction of voltage
What is the function of a DC motor?
To generate heat
To convert electrical energy into mechanical energy
To store energy
To convert mechanical energy into electrical energy
What is electromagnetic induction?
The process of creating a magnetic field
The process of generating electricity from heat
The process of generating an emf due to a change in magnetic field
The process of storing energy
What does Faraday's first law of electromagnetic induction state?
An emf cannot be reversed.
An emf can only be induced in a closed circuit.
An emf is always constant.
An emf is induced when there is a change in magnetic flux.
What does Lenz's law state about induced current?
It always flows in the same direction.
It opposes the cause that produces it.
It can be reversed at any time.
It is always weak.
What is the main function of an AC generator?
To store energy
To convert mechanical energy into electrical energy
To convert electrical energy into mechanical energy
To create a magnetic field
What is the frequency of alternating current (AC)?
It is always high.
It varies with time.
It is constant.
It is always zero.
What is the main advantage of AC over DC?
AC can be transformed to higher voltages for transmission.
AC is more efficient.
AC is easier to generate.
AC is always safer.
What is a transformer used for?
To convert AC to DC
To increase or decrease voltage
To store energy
To generate electricity
What is the difference between a step-up transformer and a step-down transformer?
Neither affects voltage.
Both do the same thing.
Step-up decreases voltage, step-down increases voltage.
Step-up increases voltage, step-down decreases voltage.
What happens to the frequency of the alternating voltage in a transformer?
It increases.
It becomes zero.
It decreases.
It remains unchanged.
What is the turns ratio in a transformer?
The ratio of number of turns in secondary to primary
The ratio of current in primary to secondary
The ratio of power in primary to secondary
The ratio of voltage in primary to secondary
What is the main purpose of using a closed core in a transformer?
To provide a closed path for magnetic field lines
To increase weight
To increase resistance
To decrease size
What is the relationship between input power and output power in an ideal transformer?
Output power is always greater.
Input power equals output power.
There is no relationship.
Output power is always less.
What type of current flows in a battery?
Static current
Pulsating current
Direct current (DC)
Alternating current (AC)
What is the main difference between AC and DC?
AC is stronger than DC.
AC flows in one direction, DC varies.
DC flows in one direction, AC varies.
Both are the same.
What is the main use of a step-up transformer?
To store energy
To decrease voltage
To generate electricity
To increase voltage
What is the main use of a step-down transformer?
To generate electricity
To store energy
To decrease voltage
To increase voltage
